// SpryImageLoader.js - version 0.1 - Spry Pre-Release 1.6
//
// Copyright (c) 2007. Adobe Systems Incorporated.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//   * Redistributions of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//   * Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//   * Neither the name of Adobe Systems Incorporated nor the names of its
//     contributors may be used to endorse or promote products derived from this
//     software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

var Spry;if(!Spry)Spry={};if(!Spry.Utils)Spry.Utils={};Spry.Utils.ImageLoader=function()
{this.queue=[];this.timerID=0;this.currentEntry=null;};Spry.Utils.ImageLoader.prototype.start=function()
{if(!this.timerID)
{var self=this;this.timerID=setTimeout(function()
{self.timerID=0;self.processQueue();},0);}};Spry.Utils.ImageLoader.prototype.stop=function()
{if(this.currentEntry)
{var entry=this.currentEntry;entry.loader.onload=null;entry.loader.src="";entry.loader=null;this.currentEntry=null;this.queue.unshift(entry);}
if(this.timerID)
clearTimeout(this.timerID);this.timerID=0;};Spry.Utils.ImageLoader.prototype.clearQueue=function()
{this.stop();this.queue.length=0;};Spry.Utils.ImageLoader.prototype.load=function(url,callback,priority)
{if(url)
{if(typeof priority=="undefined")
priority=0;this.queue.push({url:url,callback:callback});this.queue.sort(function(a,b){return(a>b)?-1:1;});this.start();}};Spry.Utils.ImageLoader.prototype.processQueue=function()
{if(this.queue.length<1)
return;var entry=this.currentEntry=this.queue.shift();var loader=entry.loader=new Image;var self=this;loader.onload=function()
{self.currentEntry=null;if(entry.callback)
entry.callback(entry.url,entry.loader);if(self.queue.length>0)
self.start();};loader.onerror=function()
{self.currentEntry=null;if(self.queue.length>0)
self.start();};this.currentLoader=loader;loader.src=entry.url;};